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Q69. What preparation is required to base metal before welding on tanks that<br />
have surface in contact with leaded gasoline?<br />
1. Scrape down to bare metal 6" (150 cm)<br />
2. Scrape down to bare meta 12" (300 cm)<br />
3. Abrasive blast any immediate areas affected<br />
4. Steam clean any immediate areas affected<br />
ANS: 2<br />
<strong>API</strong>2015: 12.4.2 Hot Work Permit<br />
In addition to the requirement for an entry permit, a qualified person shall<br />
issue a hot work permit to conduct hot work inside or around a tank that<br />
has been in leaded service.<br />
12.4.2.1 The qualified person issuing the hot work permit shall require that<br />
surfaces of tanks that have been in contact with leaded gasoline, lead<br />
additives or products containing lead be cleaned, scraped or wire brushed<br />
down. The qualified person shall assure that bare metal covers an area at<br />
least 12 inches (30 centimeters) surrounding any area that may be subject<br />
to excessive heat exposure from welding or other hot work operations.<br />
Charlie Chong/ Fion Zhang
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